B1605 Buick Code - Mirror Motor Horizontal Circuit
Quick Answer
The Driver Door Module (DDM) or Passenger Door Module (PDM) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. Common causes include Faulty Driver/Passenger Rearview Mirror Motor, Driver/Passenger Rearview Mirror Motor harness is open or shorted, Driver/Passenger Rearview Mirror Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B1605 Buick indicates Mirror Motor Horizontal Circuit.
- Common causes
- Common causes include Faulty Driver/Passenger Rearview Mirror Motor, Driver/Passenger Rearview Mirror Motor harness is open or shorted, Driver/Passenger Rearview Mirror Motor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B1605 Buick Description
Horizontal controls operate in the same manner with the mirror motor horizontal control circuit supplying voltage or ground and the mirror motor common control circuit supplying voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.
What are the Possible Causes of the DTC B1605 Buick?
- Faulty Driver/Passenger Rearview Mirror Motor
- Driver/Passenger Rearview Mirror Motor harness is open or shorted
- Driver/Passenger Rearview Mirror Motor circuit poor electrical connection
- Faulty Driver Door Module (DDM) or Passenger Door Module (PDM)
How to Fix the DTC B1605 Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B1605 02 Mirror Motor Horizontal Circuit Short to Ground
B1605 04 Mirror Motor Horizontal Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1605 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B1605 Buick Code
1. What does the OBDII code B1605 mean on a Buick?
B1605 indicates a problem in the horizontal motor circuit of the power mirror system, often due to electrical or motor-related issues.
2. What are the common symptoms of a B1605 code in a Buick?
The side mirror may not adjust horizontally, or it may move intermittently or stop responding entirely.
3. What causes the B1605 code to appear?
Common causes include a faulty mirror motor, damaged wiring or connectors in the horizontal circuit, or a malfunctioning mirror control switch.
4. Can I still drive my Buick with a B1605 code?
Yes, the code doesn’t affect drivability, but it can hinder proper mirror adjustments, which may impact visibility and safety.
5. How do I diagnose the B1605 code on my Buick?
Inspect the wiring and connectors for damage, test the mirror motor for functionality, and check the mirror control switch for proper operation.
6. How do I fix the B1605 code in a Buick?
Repairs may include replacing the mirror motor, repairing damaged wiring or connectors, or replacing a faulty control switch.
7. How much does it cost to fix a B1605 code?
Costs vary, but repairing wiring or replacing a mirror motor typically ranges from $100 to $300, depending on parts and labor.
8. Can I fix the B1605 code myself?
If you’re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it. Otherwise, professional help is recommended.
9. Will clearing the B1605 code solve the problem?
Clearing the code without addressing the root cause will only temporarily hide the issue, and the code is likely to return.
10. Could a blown fuse cause the B1605 code on a Buick?
It’s possible if the fuse linked to the mirror circuit is blown, but this is less common than wiring, motor, or switch issues.
Discuss the causes and fixes for B1605 Buick OBDII Code
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